Sand-blast blower.



D. A. M. DOUBLET. SAND BLAST BLOWER.

lAPPLICATIMI FILED 00T. 9, 1908.

y Patented Aug. 17.1909

3 SHEETS-SHEET l.

D. A. M. DOUBLET.

SAND BLAST BLOWER. APPLICATION FILED 00T. 9, 190e.

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D. A. M. DOUBLET.

-SAND BLAST BLOWER. APPLICATION FILED 00129, 1903.

j 3 SHEETSSHEET 3.

' Uvrrnnsraras raras-ta onirica nmnnnrcn 4AinvoLn MAURITZ noU'BLn'r, or nrMsBrfrnn' NEAR Hannon@ GERMANY;

No. 9s1,579.

vSpecieaton of Letteralatent.

' Patented Aug. 17, '1909.A

Application fued ocaber 9,1903.` sril N. 45am. g

T all 'whom it may concern:

B@v a known that 1,. Diemme-ARNOLD" MAURITZ DOUBLET, engineer, a subjectV of the Queen of the-Netherlands, and-'resident of munication with` the compressed ai'r andl l with the atmosphere, in order, during the` period in which the connection is established with the compressed air,- to 'supply sand to the lower chamber'from whichpthe `blastnozzle is fed. Instead of one uppeivcham'ber,

2O however, Vthe sand blast blower may comprise two or more disposed in juxtaposition or in series and placed alternately in communication with the compressed air and with the atmosphere. l

The invention aims in particular to effect the sand supply to the lower chamber (from which the blast nozzle is fed), in an automatic manner such that the sand consumption shall automatically control the supply of sand to thenozzle, in accordance with the character of the material and independently of a given period of time or of motive power operating externally tothe apparatus. r

- An automatic reversal `of two sand charnbers for) the purpose of attaining continuous working is per se known.v` Such arrangements are` however dependent upon meehanis'm having no connection .with the working ofthe blower; the reversal is-etiected at t0 iixed intervals of time, without regard to whether theconsumption of sand is greater or less, or to whether coarser or iiner sand is being employed or the apparatus is working at high or low pressure. All these condi'- tions, according to circumstances, call for a more rapidly or more slowly effected reversal which cannot be attained with the apparatus hitherto employed, as the lspeed .of the mechanism can only be altered in av yvery '50 tedious and limited manner by hand.l The time reversal method therefore vgives 'no absolute certainty for a permanent feed of sand to the nozzle, and in particular vthe blower continues to, operate during interruptions in the working of the mechanism. The working of the blower is then like that of badly attended non-automatically. re-A versed apparatus.

In* the apparatus of thepresent invention the reversal is made, dependent upon the Weight of the sand still in the collecting hopper. It therefore adapts itsel'f'perfectly automatically to the working of -the apparatus and retards' orvacceler'ates the sand feed entirely in accordance With'the consumption. 65 Thuslthe highest eciencyis. Aattained of which an automatic arrangement'is capable. AFigure 1 is a centralvertical section and vpartial elevation illustrating my improved i sand blast blower. Figj2 is a similai` view 70 illustrating a modified form of the invention and kFig?, is' lalso a view similar to Fig. 1,

-illustrating` a still furthermodied form.I of,

the invention.

In the form shown in Fig.A 1 rthe com- 75 pressed air is admittedY by the pipe a and' passes bythe pipe l; in to thevlower chamber 0. The upper chamber e is adapted to be put intocommunication with the pressure p pipe -by a valve k and pipe u, and with the 80 atmosphere by a valve n. So lf'mgl as the chamber e.is in lcommunication with thewatrnosphere, the excess ol pressure in the chamber c keeps the valve d closed. Thehopper orcontainer filled with sand. and which. is connected a ove the chamber e to the, Weights'p by ropes or the like passing over rollers h, is 1n its lowest position. The upper ,valvef of the chamber e is open and allows lthe sandto run out of the hopper g into the chamber e,V The compressed air passing up to the pipe u. is prevented from entering the chamber e by the hollowpiston valve l" which* is held in its raised/position by a spring t6 close the connection with the annular passage Z. At the same time thc air cancscape from the chamber e into the atmosphere through the hall valve n on theright. XV hen the. hopper g has emptied to such an extent that the weights p are the heavier, these dc- '100' scend and the hopper g rises. The left hand Weight strikes the spindle i of the .piston valve and forces the latter down until its l upper edge uncovers the lateral openings ol' the annular passage Z and thus allows the compressed air to enter thc chamber c.. At the same time the right hand weight forces down the rod t the noso s ol which then releases a lever r which is kopt pressed to the right by a spring; the'tail g ol' this lever is lat-.9' 'thus rocked to the left' and comes under the nose o and closes the ball valve n. so as to pretherefore sinks and theweights p l vent the compressed air from escaping` through the outlet pipe lm. The compressed air in the chamber e lifts the valve f andthereby establishes equal' 'pressure in the chambers e and c. r The valve d now opens under its own weight andthe sand falls into the. chamber' c. Meanwhile the hopper g has been again filled with sand to such an eX- tent as to be heavier than the weights p. It

rise, re-

leasing the piston valve lc and ba valve n,

' so that the upper chamber c is again out off ber c.

the blower by the pipe a and led into the lower chamber by the pipe l) as before.

from the compressed air and put into communication with the atmosphere, the result of which is that the valve d closes automatically and the valve n opens. The cycle ol' op# crations now recommcnces.

In the construction shown in Fig. 2 the movable hopper g is fitted inthe loower cham- The compressed air is admitted '-to The movable hopper g is suspended from three round rods o working in bushes w in the top and bottom ol' the chamber c and is connected at top to ropes passing around rollers 7L Iand attached to counterweights p. The latter keep the hopper g in its raised position when it is empty. The rods o are each formed with three grooves or channels 'v' and v and with two flanges uponjaud under which respectively are provided rubber' paoliing rings x. When the hopper gis filled with sand and is in its lowest position, the channels t are wholly in the chamber c and the latter is cutoff air tight from the upper packing ring fr ol' the rods fv.

chamber e by the .lower flanges and rubber On the other hand, the channels v are"in a position in which-they place the chamber e' in communication with the outer air in the hopper g. The valvef is therefore open and the sand `falls from the hopper g, into the chamber e. Nhen however the hopper g has emptied to such an extent that the weights p are the heavier, the latter raise it` so that the channels 0 pass into vthe bushes w and the upper packing rings x are pressed by their fianges against the latter, the lower channels o rising into such'a position as to allow the compressed air to enter the chamber c through thelower bushes. The upperchamber e is now cut off from the atmosphere and is in communication with the' compressed air.

yThe valve f-therefore closes automatically c. The lower hopper or container g in the chamber c is mounted on the spindleof a valve 'y' fitted in the compressed air conduit b" b u, this spindle working in a bush z.- Ihe upper hopper or container g is suspend-v ed in the chamber e by ropes passing over rollers hand attached to the counterweights p. In the position shown the chamber cis under pressure and the hopper g is filled with sand and is in its lowest position in which it keeps the valve y shut and prevents the compressed air from passing to the chamber c by the pipes t u. rihe valve d is kept.

closed by the excess of pressure in the chamber c, The hopper g in the upper chamber' e is in its raised position. The chamber e is in communication with the atmosphere by the round boxe/ formed with openings at the top, and by the pipe e. upper valve f of chamber e is open and the sand runs from the hopper g into the hopper gsuspendcdbelow it. As soon as the latter is filled to a sufficient extent to overcome the Consequently the pull ofthe counterweightsp, it descends and closes the box e by means olf the flange g* fitted with a rubber packing ring, so that no air can now escape from the chamber e. At the same time the hopper gl empties, the greater pressure in the chamber c lifts the valve y with the hopper g and the compressed air '95 passes by the pipes b and a into the chamber c and at once closes the valve The pressure in the chambers@ and c is now equal and the valve d opens by its own weight and allows the sand to run into the hopper g, which is thus caused to descend and close the valve y. At the same time the hoppervj is emptied and is lifted by the weights p and al lowed the compressed 'air' to escape from tl c' chamber e into the atmosphere through lne box e,'the series of operations then recompers in the lower chamber are attached to a lever connected through a'lever system with a three-way valve, disposed between the upper chambers and communicating with the compressed air pipe and the atmopshere,l the arrangement being such that according to the positi0n,i. e.`fi1ling or emptying-of T, y the lowerlsand hopper, the three-w-ay valvey is reversed` and the upper chamber is put into communi'gation either with the compressed air pipeo'ilfwith the atmosphere.

What I 'claim is 1. A sand blast blower comprising` superimposed chambers, asource of com ressed air, `and means for placing an upper'c amber the weight of sand in the hopper for effecting I the reversal.

2. A sand blast'blowercomprising a lower chamber and a plurahtyof upper chambers placing vthe upper chambers alternately in commumcation with the source of com# pressed vair andwith thev atmosphere, in

combination with sand hoppers, and means operated by the weight of the sand in the hoppers, for effectin the reversal.

imposed chambers, a source of compressed ,A sand blastb ower comprising superd' disposed abovc the same., and means forr air and ,means for placing an upper chamber alternately in communication with the source of compressedair and with the atmosphere for theV urpose of transferring sand' intermittently rom an upper chamber to a lower chamber, in combination with a movable sandA hopper 'means for causing the same to rise and fall under the action of ill ing and emptying, 'and means actuated through the rise and fall of the hopper'for effecting thereversal, whereby the `reversal depends on the weight of sand remaining in the hopper and adapts itself to changes in the working of the blower automatically and in dependntly of fixed 'intervals of time.

4. A sand blast blower com rising super imposed chambers, a source o compressed air, andmeans for placing an upper chamber alternately in communication' with the mospherel for the purpose of transferring the sand intermittent y from an upper chamber c toa chamber below thesame, in combination with a sandhopper arranged in thelower chamber and means operated by the weight of sand in the hopper for effecting the reversal.

able hopper so that the same is moved downwardly by thefweio'ht of the material contained therein, at the same time placing the said upper chamber into communication with the atmosphere and lcausing it to riseand at the same time to 'close the upper chamber from communication with the atmosphere and td placethe same in communication with the said lower chamber. 'f' i 6. A sand blastblowerlc'ompnsing a-casirff a transverse partition in said casing,4 di` e partition, a hopper-shaped cover for casino* above the said-u per chamber, a in tie said hop er-sfiapedl cover, a s ovable ho per in t e Alower: chamber, means for a mitting compressed "air to the said chambers and means tor supporting the said movable hop er so that the same is caused to descend y the weight of the material contained therein and at the same time toopen the said gate in the hopper-shaped cover toplace the upper chamber in com-v munication with the atmosphere and upon being emptied is caused to rise automatically .and at the same time to close lthe said gate in the said hopper-shaped cover and to open the door in the said transverse partition.

- 7. A sand blast blower .comprlsmg a case ing, a partition extending transversely across the interior of the said casing and dividing the same into superimposed chambers, 'a

y door in the said partition, bearingsalso in the said partition, a hopper-shaped cover for the said casing formingthe top of the said upper partitior` v a gate in the said hopper-shaped cover, bearings also in the said hoppershaped cover,` a vmovable hopper inthe said lowerA chamber, rods passing through and journaled in the said bearings in both the f ding the interior thereof into superlmr nosed chambers, a door'mthe saldv transsaid partitionand hopper-shaped cover and l secured to the said movable hopper, the Asaid v rods being provided with channels adjacent to both the saidbearings, pulleys, supports for the same, cords passing over said pulleys and secured at' one end to the'said rods and `counter-weights'secured to the other ends of the said cords, "and means 'whereby compressed air is admitted to the said chambers.

8. A sand blastblower comprising a blast chamber, a sand chamber, a source of compressed air, means for placing the said sand chamber alternately in communication with the source of Acompressed air and with the at mosphere for the purpose of intermittently 'supplying sand to the Asaid sand chamber, a

san hopper and means operated by the weight of the sand in the said hopper for effecting the said reversal. c

In testimony, that I claim the foregoing as my invention, .I have signed myv name in presence of two witnesses this 24th day of eptember, 1908.

DIEDERICH ARNOLD MAURITZ muten Witnesses:

ERNEST A.V H. l'. MUMMENHOFF, Ofrro' HnLLnRroH. 

